. but on friday an asteroid is going to come really close to earth. but as carl azuz explains nasa says there's nothing to worry about. asteroid 2012 da14 is about half the size of a football field, and it's headed right for us, or right near us, but before you start worrying about this. >> it's a meteor shower. >> reporter: know that nasa says this: >> the close approach of this object 2012 da14 on february 15th in nothing to worry about. its orbit is very well known, we know exactly where it's going to go, and it cannot heat the earth. >> reporter: with concerns about the end of the world put to rest, lets check out some science on this bad boy. first of, the asteroid is cruising along its 17,455 miles per hour. that's fast. but not as fast as rockets have to go in order to escape earth gravity and get in the space. speaking of gravity, it's going to give the asteroid a little extra pull as it passes by. so, as this thing is closer to earth, it's actually going to get faster. just how close is da14 going to get when it passes by on february 15th? more than 17,000 miles away from the planet.